Netfilter
Netfilter is a framework that provides hook handling within the Linux kernel for intercepting and manipulating network packets. Put more concretely, Netfilter is invoked, for example, by the packet reception and send routines from/to network interfaces. As the master Netfilter function is called with a packet, Netfilter runs through the list of registered hooks and calls the extensions in succession, which then handle packets as they desire.[1]
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Components
Extension:DynamicPageList3 (DPL3), version 3.6.4: Error: Error 1054: Unknown column 'cl1.cl_to' in 'on clause' Function: MediaWiki\Extension\DynamicPageList3\Query::buildAndSelect - Netfilter Query: SET STATEMENT max_statement_time=10 FOR SELECT DISTINCT IFNULL(cl1.cl_sortkey, REPLACE(CONCAT(CASE `wp_page`.page_namespace WHEN 1 THEN 'Talk:' WHEN 2 THEN 'User:' WHEN 3 THEN 'User_talk:' WHEN 4 THEN 'RaySoft:' WHEN 5 THEN 'RaySoft_talk:' WHEN 6 THEN 'File:' WHEN 7 THEN 'File_talk:' WHEN 8 THEN 'MediaWiki:' WHEN 9 THEN 'MediaWiki_talk:' WHEN 10 THEN 'Template:' WHEN 11 THEN 'Template_talk:' WHEN 12 THEN 'Help:' WHEN 13 THEN 'Help_talk:' WHEN 14 THEN 'Category:' WHEN 15 THEN 'Category_talk:' END, `wp_page`.page_title), '_', ' ')) AS `sortkey`,`wp_page`.page_namespace AS `page_namespace`,`wp_page`.page_id AS `page_id`,`wp_page`.page_title AS `page_title` FROM `wp_page` `wp_page` JOIN `wp_categorylinks` `cl1` ON ((`wp_page`.page_id = cl1.cl_from AND cl1.cl_to = 'Netfilter')) JOIN `wp_categorylinks` `cl2` ON ((`wp_page`.page_id = cl2.cl_from AND cl2.cl_to = 'Component')) WHERE `wp_page`.page_is_redirect = 0 AND `wp_page`.page_namespace = 0 ORDER BY sortkey ASC LIMIT 500